What Makes Us Special

Three Very Unique Acoustic Solutions

1. Activated Carbon Diaphragmatic Absorbers: The first solution is our low frequency activated carbon bass absorbers which can be built into your walls or placed in your room as free standing units. They are the most powerful bass absorbers available on the commercial market. Our ACDA 12 unit achieves 100% absorption at 50 Hz., 63% at 40 Hz. and continue doing a great job down into the 30 Hz. range. Whereas our ACDA 10unit provides broadband absorption from 30 Hz. to 400 Hz. at 25% average. And all of this is achieved in just a 10″ depth space.

Our low frequency absorption rates have been independently tested and verified by the World famous Riverbank Acoustical Laboratories (now Alion Labs). You can see their report for the ACDA 12 Riverbank Acoustical Labs Testing Results here and the ACDA 10 Riverbank Acoustical Labs Testing Results here. The graphs you can see show the absorption levels verified in the reports.

ACDA-12 Absorption Chart

ACDA-12 Absorption Performance Chart

ACDA-10 Absorption Chart

ACDA-10 Absorption Performance Chart

2. Acoustic Foam with Smooth Absorption Curve: Secondly our acoustic foam has a smooth absorption curve and is wonderful for music and voice. It absorbs more energy from 125 Hz. – 250 Hz. than other foams on the market and does so at a rate and level that is smooth across the frequencies. It’s a lot more dense than common foams and a refrain I often hear from customers runs along the lines of “I’ve never felt foam like this before”.

3. Diffusion and Low Frequency Absorption in one unit: Finally we have created an industry first by marrying our low frequency activated carbon technology with the time tested process of quadratic diffusion. This tool solves two important acoustical problems in one unit.

All of these technologies are unique in their performance. Foams have been around for years, and “bass traps” have been around almost as long. Our foam and low frequency activated carbon absorbers are unique at the rates and levels they perform at.

New Definitions Needed

The term “bass trap” is a misnomer. Bass is never trapped. With its long and powerful wavelengths, all one can do is slow the low frequency wave down enough to absorb some of its energy. You want to absorb enough to have an impact on the attack and decay of low frequency notes. You want to hear that fifth string at 30 Hz. on a bass guitar, along with and most of the time beside, the bass drum notes. Bass energy goes through everything. You must first slow it down and then use sound absorption technology that is purposely designed to absorb low frequency waves.

You cannot use foam, boxes filled with building insulation, or cardboard tubes for such a task as they don’t have the horsepower to handle low frequencies below 100 Hz. in an acceptable way. Instead you must use time tested and proven diaphragmatic absorption and, thanks to the activated carbon sponge we’ve put inside our units, you now get a turbo charged version.

Diaphragmatic Absorber

Option 1 = Free Standing Activated
Carbon Bass Absorbers

ACF Install

Option 2 = Activated Carbon Bass
Absorber Filters Built Into Your Walls

Foam Comparison Chart

AF Sound Absorption Chart

1. Activated Carbon Diaphragmatic Absorbers:

Diaphragmatic absorption has been used in professional recording studios for years with great success. A diaphragmatic absorber is an absorber that has a cabinet of a certain depth with a front wall or diaphragm that moves in relation to the sound pressure that is exerted upon it. It is a similar movement as found in our speakers when they move back and forth in response to an applied electric current. Obviously, it is on a much smaller movement scale because we are using sound pressure to affect movement rather than electricity.

Two Front Walls

Once low frequency energy strikes the surface, it starts the front wall or diaphragm moving. In our diaphragmatic absorbers, we have two front walls that move in vibrational sympathy with each other to have a much larger impact on slowing the low frequency wavelength down. They are designed to compliment each other in movement against the low frequency energy. Once it is slowed down, it then enters the inside cabinet depth. Most diaphragmatic absorbers have a mineral wool or building insulation type material inside the diaphragmatic absorber to control internal cabinet resonances and to also assist with the cabinet’s overall low frequency absorption. We do not.

Activated Carbon Or Charcoal

We use activated carbon or charcoal. Charcoal has a much higher rate and level of absorption than anything currently in the market place and can turn a standard diaphragmatic absorber into an absorber on steroids. A gram of the stuff has over 2,000 sq meters of surface area and we place over 65 lbs. of activated carbon inside each one of our ACDA-10 and ACDA-12 activated carbon absorbers! With this as our cabinet fill material, we achieve an overall cabinet “Q” value that is greatly improved. Our absorbers weigh in at 200 lbs. each and absorb at rates and levels never before achieved in a commercially available product. We are very serious about low frequency absorption.

Multiple Layered Cabinet

To encourage the front two walls to be the only two walls that are moving, we make our cabinets as rigid and inert as possible. Our cabinets have seven layers of different materials with different densities all layered together with viseo elastic damping compounds between each layer. Our cabinets are stronger and better built with our ACDA-10 and ACDA-12 units than most speaker cabinets.

Everest Master Handbook of Acoustics

2. Acoustic Foam with Smooth Absorption Curve:

Our foam absorbs more energy in the critical mid frequency band between 125 Hz. – 250 Hz. Our foams absorb 6 times as much energy as Aurelex and Sonex at 125 Hz. and 10 times more absorbing at 250 cycles. If you have been in a room that is treated with Aurelex or Sonex, you know the sound. One can tell it immediately. It has a certain sound to it.  Both companies foams sound remarkably the same. Our foam is different. With higher rates of absorption at this critical band from 125 Hz. – 250 Hz. different sonic benefits are realized, especially in the emotionally connecting mid ranges.

We Are Different

With higher rates of absorption, we do two things very differently. We create a smoother absorption curve with our larger absorbing rates, since most open celled acoustic foams all absorb the same after 500 Hz. Most foams are at 100 % absorption at 500 cycles and stay at 100 % up through 4,000 Hz. The most important part of the frequency spectrum that needs management through absorption in our rooms is the low middle range which is below 250 cycles.

Vocal And Instrument Separation And Definition

Aurelex and Sonex can not do that because neither one absorbs any significant amount to make a noticeable sonic difference.. We can make a difference because our foam is much denser with more open cell continuity throughout the foam construction . With more absorption in this frequency range , we minimize room sound from reflections and then our vocals, where all our emotional connection lies, are more defined. Our vocals, now with greater definition and separation and less room sound come more forward in our sound stage and come forward to greet you in your room.  Our foams are available in 1/2″ , 1″, and 2″ thicknesses.

Foam Comparison Chart

Acoustic Foam in action

3. Diffusion and Low Frequency Absorption in one unit:

I fell in love with sound diffusers a long time ago but I wanted a solution that would do something unique. So I took a quadratic diffusor, the most time tested and proven method of diffusion in the world, and inserted my low frequency activated carbon technology into it so that we could achieve both diffusion and absorption in one single unit. This is an industry first and ensures you are able to enjoy incredible separation, definition, and additional timbre quality to your precious mid range and vocal, so you can hear more of everything that’s really important in your music.

You can enjoy diffusion from 200 Hz. all the way up to 3,400 Hz. along with a broadband, low frequency absorber technology using activated carbon filters. Now you have a diffusor/absorber that starts absorbing energy at 30 Hz. and moves through 200 Hz. Add it all up and you get middle range diffusion and low frequency absorption all in one beautifully crafted unit. You now have a product that does two things incredibly well. This is a first in acoustical products.


Contact us at: info@acousticfields.com for a free no obligations consultation or call toll free on 520–392–9486.

Quadratic Diffusor Absorber

Quadratic Diffuser Absorber

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